2.1.20 [P3P1.0:2002] Section 3.4, Categories and the CATEGORIES element

V0028:

The specification states:

 categories = "<CATEGORIES>" 1*category "</CATEGORIES>" 
  
 category = "<physical/>"    | ; Physical Contact Information
 "<online/>"      | ; Online Contact Information
 "<uniqueid/>"    | ; Unique Identifiers
 "<purchase/>"    | ; Purchase Information
 "<financial/>"   | ; Financial Information
 "<computer/>"    | ; Computer Information
 "<navigation/>"  | ; Navigation and Click-stream Data
 "<interactive/>" | ; Interactive Data
 "<demographic/>" | ; Demographic and Socioeconomic Data
 "<content/>"     | ; Content
 "<state/>"       | ; State Management Mechanisms
 "<political/>"   | ; Political Information
 "<health/>"      | ; Health Information
 "<preference/>"  | ; Preference Data
 "<location/>"    | ; Location Data
 "<government/>   | ; Government-issued Identifiers
 "<other-category>" PCDATA "</other-category>" ; Other

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The CATEGORIES element is not required to contain any subelements. Empty CATEGORIES elements are ignored.